What are the dimensions of a twin bed?

Question

I'm making a quilt for a twin bed and I need the dimensions so I can figure out what design I'm going to use.

Answer 1

Standard Twin Mattress: 39" X 75"

The following sizes are mattress measurements. You will need to add to these measurements to allow for overhang. Remember: that bed sizes can vary a few inches between makers.
King Size 76" x 80"
California King Size 72" x 84"
Queen Size 60" x 80"
Double Size 54" x 75"
Twin Size 39" x 75"
Crib Size 27" x 50"

The following are some suggestions for amounts to add for overhang.
Allowance for Pillows
18"
Overhang at Foot
12"
Overhang at Sides
12" x 2 = 24"